Hands-On Internet of Things with MQTT

Controlling the servo motor via the Serial Monitor

In the previous section, we verified the following:

• Whether the Arduino can connect to the internet
• Whether the Arduino can send and receive MQTT messages via shiftr.io
• Whether the motor is working

Now, let's create an interface to control the servo from the Serial Monitor. Create a new sketch and save it as ch5_01_servo_serial.

Delete the boilerplate code that is automatically added to new sketches (the empty setup and loop functions) and replace the contents of your editor with the following code:

#include <Servo.h> Servo myservo; void setup() {  Serial.begin(9600);  myservo.attach(9);} void loop() {  while (Serial.available() > 0) {    int inputValue = Serial.parseInt(); if (inputValue == ...